cpufreq: exynos5440: Protect OPP search calls with RCU lock
As per the OPP library documentation(Documentation/power/opp.txt) all
OPP find/get calls should be protected by RCU locks.
Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
index ead7ed4..0c74018 100644
--- a/drivers/cpufreq/exynos5440-cpufreq.c
+++ b/drivers/cpufreq/exynos5440-cpufreq.c
@@ -120,11 +120,13 @@
int i = 0;
struct opp *opp;
+ rcu_read_lock();
for (i = 0; freq_tbl[i].frequency != CPUFREQ_TABLE_END; i++) {
opp = opp_find_freq_exact(dvfs_info->dev,
freq_tbl[i].frequency * 1000, true);
if (IS_ERR(opp)) {
+ rcu_read_unlock();
dev_err(dvfs_info->dev,
"failed to find valid OPP for %u KHZ\n",
freq_tbl[i].frequency);
@@ -159,6 +161,7 @@
__raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 * i);
}
+ rcu_read_unlock();
return 0;
}